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Journal articles
Magazine articles
Open Access
Evaluation of folding effects on coating damage, TAPPI Journal November 2024

ABSTRACT: Barrier coatings on paperboard need to maintain integrity during converting and end-use for effective barrier performance. Folding is one of the most common deformations during converting; however, factors that affect damage during folding are not well defined. This is partly because methods to fold specimens and characterize damage are not standardized and the results are generally not transferable. In this work, we describe a method to fold paper specimens precisely and reproducibly. The keys to folding include using a defined geometry and controlled deformation. Multiple methods can be used to quantify damage; in this case, we use differences in permeability as a measure of how the coating becomes more open. Damage is sensitive to the degree of compression after the initial folding. Using a shim for support provides a defined amount of compression and minimizes the sensitivity to the applied pressure.

Journal articles
Magazine articles
Open Access
Colloid chemical aspects of paper formation in the presence of nanofibrillated cellulose and cationic starch, TAPPI Journal September 2024

ABSTRACT: A series of experimental tests were carried out to examine colloidal-scale consequences of optionally treating nanofibrillated cellulose (NFC) with cationic starches of different charge density and dosage (0.5% or 2.0% by weight), adding that material to a furnish prepared from 100% recycled copy paper, and then subjecting the mixture to very different levels of hydrodynamic shear. Tests included optical microscopy, sediment volume tests, sediment velocity tests, and “percent fines” assessment by means of a fiber quality analyzer (FQA). In addition, the zeta potential and charge demand of the studied materials were evaluated. Optical imaging revealed that cationic starch treatment of the NFC tended to agglomerate it into multiparticle clusters, which sometimes could be mostly redispersed by hydrodynamic shear. Subsequent addition of the starch-treated NFC to the default furnish resulted in much of the colloidal material becoming attached to fibers. Subsequent shearing of the mixtures was at least partly effective in separating the clusters of NFC from the fiber surface, resulting in essentially a two-component mixture. Multiparticle NFC clusters coexisted with the fiber suspension, sometimes attached and sometimes not, depending on the details of treatments. Sediment volume tests showed that systems containing cationic starch-treated NFC tended to have a higher density after settling in comparison to untreated NFC; these findings are consistent with the cationic starch acting as a stabilizer on the solid surfaces, allowing them to slide past each other during the settling process. Application of intense hydrodynamic shear tended to result in denser sediment. Results of tests with the sediment velocity messurement and the FQA percent fines assessment did not correlate well with changes in test conditions considered in this study.

Journal articles
Open Access
Editorial: TAPPI JOURNAL 2014 Best Research Paper Award highlights potential of cavitation-jet deinking, TAPPI JOURNAL April 2015

Editorial: TAPPI JOURNAL 2014 Best Research Paper Award highlights potential of cavitation-jet deinking, TAPPI JOURNAL April 2015

Journal articles
Magazine articles
Open Access
Effect of conductivity on paper and board machine performanc

Effect of conductivity on paper and board machine performance— a review and new experiences, TAPPI JOURNAL October 2017

Journal articles
Open Access
Evaluation of cut quality of woodfree coated papers, TAPPI JOURNAL September 2013

Evaluation of cut quality of woodfree coated papers, TAPPI JOURNAL September 2013

Journal articles
Open Access
Role of particle size and preflocculation of talc in improvement of paper properties, TAPPI JOURNAL April 2014

Role of particle size and preflocculation of talc in improvement of paper properties, TAPPI JOURNAL April 2014

Journal articles
Open Access
Effect of reduced pulp xylan content on wet end chemistry and paper properties â?? a pilot scale study, TAPPI JOURNAL February 2014

Effect of reduced pulp xylan content on wet end chemistry and paper properties — a pilot scale study, TAPPI JOURNAL February 2014

Journal articles
Open Access
The influence of paper surface energy on multicolor offset print mottling, TAPPI JOURNAL February 2013

The influence of paper surface energy on multicolor offset print mottling, TAPPI JOURNAL February 2013

Journal articles
Open Access
Margins-based planning applied to newsprint manufacturing, TAPPI JOURNAL January 2014

Margins-based planning applied to newsprint manufacturing, TAPPI JOURNAL January 2014

Journal articles
Open Access
Thin coatings for paper by foam coating, TAPPI JOURNAL July 2014

Thin coatings for paper by foam coating, TAPPI JOURNAL July 2014

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